:root {
  --primary-color: #2563eb;
  --secondary-color: #3b82f6;
  --accent-color: #60a5fa;
  --background-color: #f8fafc;
  --text-color: #1e293b;
  --light-text-color: #64748b;
  --border-color: #e2e8f0;
  --card-bg: #ffffff;
  --success-color: #10b981;
  --error-color: #ef4444;
  --warning-color: #f59e0b;
  --max-width: 1200px;
  --header-height: 70px;
  --transition-speed: 0.3s;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background-color: var(--background-color);
  color: var(--text-color);
  line-height: 1.6;
}

.app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.main-content {
  flex: 1;
  padding-top: var(--header-height);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-speed);
}

a:hover {
  color: var(--accent-color);
}

button {
  cursor: pointer;
  border: none;
  background: var(--primary-color);
  color: white;
  padding: 10px 20px;
  border-radius: 4px;
  font-size: 16px;
  transition: background-color var(--transition-speed);
}

button:hover {
  background-color: var(--secondary-color);
}

h1, h2, h3, h4, h5, h6 {
  margin-bottom: 1rem;
  font-weight: 600;
  line-height: 1.2;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.5rem;
}

h5 {
  font-size: 1.25rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: 1rem;
}

img {
  max-width: 100%;
  height: auto;
}

.section {
  padding: 60px 0;
}

.section-title {
  text-align: center;
  margin-bottom: 40px;
}

.section-subtitle {
  text-align: center;
  color: var(--light-text-color);
  margin-bottom: 40px;
  font-size: 1.1rem;
}

.card {
  background-color: var(--card-bg);
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  padding: 20px;
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: white;
  border-radius: 4px;
  text-align: center;
  transition: background-color var(--transition-speed);
}

.btn:hover {
  background-color: var(--secondary-color);
  color: white;
}

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--primary-color);
  color: var(--primary-color);
}

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
}

.text-center {
  text-align: center;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 20px;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.75rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .section {
    padding: 40px 0;
  }
}
